JPH0520094Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that connects a rotary to the rear of a subsoil crusher and stirs and mixes subsoil into cultivated soil at the same time as subsoil crushing.

[Conventional technology] Recently, in cultivated land such as heavy clay soil, volcanic ash or sandy soil is added, and in the first step, a subsoil crusher is used to crush the compacted layer and consolidated layer, and the subsoil is crushed. A soil improvement method was attempted in which soil was dropped into narrow vertical grooves that reached the subsoil created by the machine, and in the second step, a rotary was used to stir and mix the soil into the cultivated soil to create cultivated soil, with good results. It has gained. In other words, this construction method is
By putting some of the added soil into the subsoil through a narrow vertical groove that reaches the subsoil, and mixing the added soil well with the cultivated soil,
Along with the effect of improving the physical and chemical properties of the soil by adding soil,
This has the effect of improving the permeability of cultivated land over a long period of time.

The subsoil crusher is directly mounted on a two-point support in the center of the rear of a crawler tractor (hereinafter abbreviated as "tractor") so that it can be raised and lowered and fixed using hydraulic pressure, and the machine frame is perpendicular to the forward direction. A well-known method is used, in which multiple crushed subsoil bodies are arranged at equal intervals and fixed in a hanging manner, and has a tilling width of approximately 2.6 m and a maximum tilling depth of 60 cm.

In addition, this sub-soil crusher adjusts the sub-soil crushing body to a predetermined plowing depth using hydraulic pressure via the machine frame, maintains the plowing depth and tills, and uses the pitching of the tractor due to the unevenness of the cultivated land to move the rear part of the machine frame. When the machine tilts and the plowing depth changes, the tractor operator uses hydraulic operation to correct the tilt of the machine frame.
Work is being carried out after returning to the specified plowing depth.

On the other hand, rotary work is carried out by mounting a well-known side drive rotary for farming on a wheel tractor directly on a hydraulic three-point support device.

[Problems to be solved by the invention] Although the above-mentioned tillage improvement method is highly effective, it has the problem of low work efficiency because it currently involves two steps. In addition, with this method, it is desirable to add soil to a thickness of 10 to 15 cm and stir it into the original cultivated soil to create a soil with a thickness of 25 to 30 cm. There was also the problem that it was difficult to create the above-mentioned soil layer because the limit was about 15 cm.

As a means to solve the above-mentioned problems and increase work efficiency, it is necessary to connect the subsoil crusher and rotary,
It is possible to complete the work in one step. As an example of a system in which a subsoil crusher and a rotary are connected, a "subsoil crushing rotary" is disclosed in JP-A-55-111701, for example. However, this subsoil crushing rotary has a subsoil crushing body placed behind the rotary, and when used in the above-mentioned construction method,
As the subsoil crusher progresses along the track where the subsoil and topsoil have been stirred and mixed, some of the subsoil is put into the narrow vertical groove that reaches the subsoil, which is created by the passage of the subsoil crusher, and has the effect of improving the cultivated soil. I can't expect that. In the end, in order to carry out the above method in one step, it is appropriate to connect a rotary to the rear of the subsoil crusher in accordance with the current process order.

In the case of this connection, as mentioned above, even if the tractor operator frequently operates the hydraulic pressure to adjust the plowing depth to raise and lower the subsoil crusher, the rotary plowing depth remains unchanged. Also, at the end of the cultivated field, it was necessary to provide a connection to the subsoil crusher so that the rotary can be raised above the ground together with the subsoil crusher. Another problem that had to be solved was that the connection between the subsoil crusher and the rotary needed to be sufficiently strong, since the aforementioned construction method involved considerable heavy work.

On the other hand, existing rotary rotors do not have sufficient plowing depth, so a tilling rotor with a large rotational diameter is required, and for this purpose it is necessary to devise a system with a transmission mechanism that can transmit a large tilling torque. Nakatsuta. In addition, since the large traction resistance of the subsoil crusher can be reduced, it is appropriate to use a rotary rotary machine that plows into downcuts that have a pushing action. However, the rotary down cut may be lifted by the cutting reaction force of the tiller blade and the tillage depth may become shallow, so it is necessary to solve the problem of connecting it to the subsoil crusher to prevent the tillage depth from becoming shallow. Ta. Furthermore, in order to efficiently stir and mix the soil into the cultivated soil, it is desirable that the rotary be capable of easily changing the rotational speed of the tilling rotor in response to changes in the forward speed of the tractor and soil properties.

The present invention solves the problems and requests explained above, and enables the above-mentioned tilled soil improvement method to be completed efficiently and effectively in one step, by stirring and mixing additional soil into the tilled soil at the same time as crushing the subsoil. The purpose is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows. That is, the front end portion is pivotally attached to the upper part of the machine frame of the known subsoil crusher at equal positions left and right from the center of the machine frame, and rotary mounting arms are arranged parallel to the left and right and protrude from the rear with equal lengths. and a rotary lifting guide having an upper pin and a lower pin passed through the rectangular frame horizontally so as to be able to adjust their positions above and below the rotary mounting arm, respectively, through a rectangular frame through which the rotary mounting arm is slidably vertically slidable in the direction. were erected at the rear of both ends of the machine frame, facing left and right.

Then, both side drive rotaries (hereinafter referred to as "double drive rotary") are fixed below the rear end of the mounting arm horizontally and perpendicular to the tractor forward direction, and the both drive rotaries are attached to plowing depth adjustment rulers on both outer sides. A reduction transmission that changes the rotation speed to an appropriate number of stages receives power from the tractor PTO shaft via a universal joint shaft at the front of the upper center (hereinafter abbreviated as reduction transmission).
A transmission mechanism is provided at the rear of the speed reduction transmission to rotate the subsoil crusher in a down-cut manner at the tilling width of the subsoil crusher. When the subsoil crusher is raised, the upper surface of the lower pin of the rotary lifting guide comes into contact with the lower surface of the rotary mounting arm, and both drive rotaries rise above the ground together with the subsoil crusher. .

[Function] The device of the present invention configured as described above is connected to a tractor and lowers the subsoil crushing body into the ground to a predetermined plowing depth using hydraulic pressure, and advances through cultivated land where soil such as volcanic ash has been scattered. While crushing the subsoil, a subsoil crusher excavates a narrow vertical groove from the ground surface to the subsoil, expands and softens the cultivated soil and raises the ground surface, and drops the subsoil into the vertical groove and into the subsoil. The rotary mounting arm is
Both drive rotaries, which are fixed horizontally and perpendicular to the tractor forward direction below the rear end, are towed behind the subsoil crusher, and the front end pivots until they come into contact with the upper and lower pins of the rotary lifting guide. The subsoil crusher can be rotated up and down through the sub-soil crusher to maintain a predetermined plowing depth even when the subsoil crusher is raised and lowered to a certain extent by hydraulic pressure.

The rotary lifting guide has a rectangular frame that supports the middle part of the rotary mounting arm so that it can slide up and down, prevents the front end of the rotary mounting arm from swinging left and right, and connects the subsoil crusher and both drive rotaries. In addition to reinforcing the rotary mounting arm, the rotary mounting arm can be smoothly pivoted up and down around the pivot at the front end. In addition, the lower surface of the upper pin of the rotary lifting guide comes into contact with the upper surface of the rotary mounting arm, which limits the lifting of the rotary mounting arm, and prevents both drive rotaries from being lifted by the cutting reaction force of the tilling blade and reducing the plowing depth. To prevent. Also, the upper surface of the lower pin comes into contact with the lower surface of the rotary mounting arm, and as the subsoil crusher rises, both drive rotaries rise above the ground.

Both drive rotaries receive power from the tractor PTO shaft via the universal joint shaft, and together with the subsoil crusher, are towed by the tractor and move forward. The soil is tilled to a deep level and the added soil is stirred and mixed into the cultivated soil to create a level cultivated soil.

In addition, both drive rotaries are rotated by the torque from the tractor PTO shaft, which is increased by the reduction gear transmission and the transmission mechanism installed behind it, and plow down to a large plowing depth. The soil is pushed out to reduce traction resistance, and the tilling width of the subsoil crusher is increased to ensure that no soil is left behind. Furthermore, the reduction gear mechanism installed at the center of the upper part of both drive rotaries changes the rotation speed of the rotary to an appropriate number of stages, so that both drive rotaries can mix soil and cultivated soil well according to the soil quality and the forward speed of the tractor. do.

[Example] Next, an example will be described with reference to the drawings.
In Figs. 1 and 2, numeral 1 indicates the entire subsoil crusher. 3 is crawler tractor T (hereinafter referred to as
This is a hit plate attached to the center of the rear of a tractor (abbreviated as "tractor"), with two plates forming an upper hit 14 and a lower hit 15 facing left and right, and fixed symmetrically with respect to the vertical center line of the tractor. be.

Reference numeral 4 denotes a machine frame, in which tow bars 17, 17 are fixed at their bases and protrude parallel to the front from the center of the front surface of the crossbeam 16 at equal positions on the left and right sides, and their front ends are attached to lower hits 15, 15, respectively. Inset, horizontal axis 18,1
It is connected to the hit plate body 3 through a shaft 8 so as to be able to move up and down. 17a is a reinforcing plate fixed inside the traction bars 17, 17, and 20, 20 is a reinforcing brace fixed between the cross beam 16 and the traction bars 17, 17.

5 is a subsoil crushing body, and a blade body 5b is fixed only to the lower end of the vertical blade column 5a. 21 With beam column brackets, four pieces are fixed by welding at symmetrical positions with respect to the center line in the longitudinal direction of the cross beam 16, and vertical edge columns 5a are attached to vertical grooves with a U-shaped cross section that are open to the rear and are formed at the rear.
and attach the upper part with bolts and nuts 22, 22, respectively, and attach the crushed subsoil body 5 to the crossbeam 16.
It is fixed hanging down at the rear of the. The chisel blade body 5b is
A chisel 5e is fixed diagonally downward by welding to the front end of the bottom side plates 5c, which are fixed on both sides of the lower end of the left and right vertical cutting columns 5a with bolts and nuts 5d, respectively. Swept blade blades 5f, 5f are provided outwardly from the blades 5c, 5c, respectively, and are welded to the front with a slight downward inclination.

The subsoil crushing body 5 has a height of about 1.2 m, a cutting width of the chisel blade 5b of about 50 cm, an interval of about 70 cm, and a crossbeam 16.
The subsoil crusher 1 has a tilling width of approximately 2.6 m and a maximum tilling depth of 60 cm.

Reference numerals 6 and 6 designate double-acting hydraulic cylinders, and the bases of the cylinders are pivotally connected to the upper hits 14 and 14 of the hit plate body 3 by horizontal shafts 19, respectively, and the tips of the piston rods are connected to the upper surfaces of the intermediate parts of the tow bars 17 and 17. The machine frame 4 is pivotally connected to the horizontal shafts 23 and receives hydraulic pressure from a tractor via hydraulic hoses (not shown) to lower the subsoil crusher 1 to a maximum plowing depth of 60 cm and to raise it above the ground. are provided so as to be raised and lowered and fixed around the horizontal shafts 18, 18.

To explain with reference to FIGS. 3 and 4, 24,
24 is a U-shaped bracket formed in a U-shape when viewed from the front;
They are fixed and erected by welding at equal positions on the left and right from the center of the upper front surface of the cross beam 16. 7, 7 are rotary mounting arms formed into square pipes, whose front ends are fitted inside U-shaped brackets 24, 24, connected by horizontal shafts 25, 25, respectively, and arranged parallel to the left and right at the rear of the machine frame 4. It is a long and outstanding one.

Reference numerals 8 and 8 designate rotary lift guides, in which rectangular frames 9 and 9, which are formed into a rectangle in front view, are attached to both ends of the crossbeam 16 so that the rotary mounting arms 7 and 7 can vertically slide vertically through the guides. They are fixed and erected on the upper surfaces of rectangular substrates 9a, 9a that protrude rearward from the section, and are placed side by side facing each other on the left and right sides. And each upper pin 10
and the lower pin 11, the rotary mounting arm 7,
Holes 9b, .

When the upper pin 10 is attached to the uppermost hole 9b, the above-mentioned hole 9b is such that when the upper pin 10 is attached to the uppermost hole 9b, both the drive rotaries fixedly provided below the rear ends of the rotary mounting arms 7, 7, as described later, will be operated by tilling resistance. The upper surface of the rotary mounting arms 7, 7 touches the lower surface of the upper pin 10 as it rises, restricting the rise of the rotary mounting arms 7, 7, and determine the position so that the plowing depth is not less than about 20 cm. Holes 9b are bored at equal pitches. The lowermost hole 9b for attaching the lower pin 11 is such that when the subsoiling crusher 1 is raised, the upper surface of the lower pin 11 comes into contact with the lower surface of the rotary mounting arm 7. It is also drilled so that it rises above the ground.

Both drive rotaries 2 are fixed horizontally and perpendicularly to the forward direction of the tractor at the rear lower part of the rotary mounting arms 7, 7, and are provided so as to till the tilling width of the subsoil crusher 1. Reference numeral 26 denotes a cross beam, which is fixed to the lower surface of the rotary mounting arms 7, 7 horizontally and perpendicular to the direction in which the tractor advances, with both ends protruding equally outwardly from the left and right rotary mounting arms 7, and the tilling rotor 27 is mounted horizontally on the lower surface. (See Figures 2 and 5). 7a and 7b are reinforcing braces fixed between the cross beam 26 and the rotary mounting arms 7, 7.

A rotor cover 28 has a semi-circular longitudinal section and covers the upper half of the tilling rotor 27, and side plates 28a and 28b are vertically fixed to the left and right outer end surfaces (see FIGS. 6 and 7). Reference numeral 29 denotes a flat plate made of a rubber plate, the upper end of which is attached to the lower surface of the rear end of the rotor cover 28, and rods 29a, 2 that protrude rearward from both sides and the center of the rotor cover 28, respectively.
9b and 29c, it is suspended by a chain 29d so that the height can be adjusted.

Referring also to FIGS. 6 to 9, plowing depth adjusting ruler wheels 30 and 30 are provided on both sides of both drive rotaries 2 so as to be adjustable in height. That is, a rubber wheel 32 is pivotally supported at the lower end of the shank 31, and the shank 31 is mounted on a socket body 33 fixed perpendicularly to the outer surface of the rear half of the side plates 28a, 28b of the rotor cover 28.
The height adjustment hole 31 provided in the shank 31 is inserted into the hole 33a on the upper part of the socket body 33 so that it can be raised and lowered.
Adjust a, ... as appropriate, and tighten the bolt/nut 31b.
(see Figure 2), and the height can be adjusted.

Reference numeral 34 in FIGS. 2 and 5 is a rectangular underframe, the base of which is fixed to the front of the central part of the crossbeam 26, and horizontally protrudes toward the immediate rear of the crossbeam 16 of the subsoil crusher 1. Both sides are reinforced with braces 35, 35 fixed inside the rotary mounting arms 7, 7. Reference numeral 36 denotes a reduction gear mechanism, which is fixed to the front upper surface of the rectangular underframe 34, with one end of the input shaft 37 protruding horizontally from the front and one end of the output shaft 38 from the rear, and can be tilted back and forth and fixed to one outer surface. Change lever 3
9 and 40 are provided. Then, the reduction transmission 36 connects the tractor PTO shaft 12 to the universal joint shaft 1.
3, the input shaft 37 receives power, and the rotational speed of the output shaft 38 is reduced in four steps as described later.

44 is a coupling that connects the rotary drive shaft 45 to the output shaft 38. Reference numeral 46 denotes a bearing that pivotally supports the rotary driving shaft 45, 47 a safety clutch equipped with a shear pin (not shown), and 48 a cover for the safety clutch, each of which is fixed to the rectangular frame 34. A gearbox 49 is fixed to the upper surface of the central part of the crossbeam 26, and houses a bevel gear mechanism (not shown) inside, converts the direction of rotation of the rotary drive shaft 45 at right angles to the left and right, and rotates the rotation of the rotary drive intermediate shaft 50 and 51. The rotary drive intermediate shafts 50 and 51 have their intermediate portions supported by bearings 52 and 53 fixed to the upper surface of the cross beam 26, and further have both end portions supported by bearings 54 fixed to the upper surface of both end portions of the cross beam 26, respectively. and 55, and both end portions slightly protrude outward from the bearings 54, 55.

Referring also to FIGS. 5 to 7, the chain case 56
and 57 are the side plates 2 on both sides of the rotor cover 28.
fixed perpendicularly to the outer surfaces of 8a and 28b,
The outer end portions of the rotary driving intermediate shafts 50 and 51 protrude inwardly, and a sprocket 58 is fixed to each of the protruding ends. The chain cases 56 and 57 pivotally support both ends of a tilling shaft 27a inside their lower parts, and sprockets 59 are fixed to the projecting ends of the tilling shaft 27a that protrude into the chain cases 56 and 57, respectively. Chains 60 are wound around sprockets 58 and 59, respectively.

Both drive rotaries 2 are connected to the tractor.
Power is received from the PTO shaft 12 via the universal joint shaft 13 to the reduction transmission 36, and from the rotary drive shaft 45 connected to the output shaft 38, the sprocket 59,
59, the tilling rotor 27 is rotated in a down-cut direction.

The tilling rotor 27 has a rotation diameter of approximately 80 cm to enable a maximum plowing depth of 30 cm.

Referring to Fig. 5, 27b, . . . are tilling blade mounting plates made of steel plate with a thickness of 12 mm and an outer diameter of about 30 cm, seven of which are arranged at equal intervals and the tilling shaft 27a passes orthogonally through the center of the plates. Tilling blades 27c and 27d, which are welded and whose tips are bent left-handed and right-handed, are made to protrude radially from the outer periphery while alternating in phase by 90 degrees in the rotational direction of the tilling rotor, and are fixed with bolts and nuts 27e, respectively. are doing.

FIG. 10 schematically shows the gear mechanism of the reduction transmission 36. In the figure, the input shaft 37 and the output shaft 38 are aligned with their axes in line and pass through the upper part of the gear box 41 in the front and back direction.
It is pivoted on 1. 42, 42 is a gear box 41
The terminal portions of the input shaft 37 and the output bearing 38 are each supported by bearings fixed inside the shaft. 43
is the counter shaft, the input shaft 37 and the output shaft 38
It passes through the lower part of the gear box 41 in parallel with the gear box 41 and is pivotally supported by the gear 41. A and B are gears whose centers are fixed to the middle part of the input shaft 37. E and F are gears that are formed integrally with their centers coincident with each other with a suitable gap in between. There is.

Reference numeral 39a is a biasing fork whose upper end is fitted into the gap between gears E and F, and works in conjunction with the change lever 39 described above to change gear E to gear A and gear F.
is selectively engaged with gear B. Similarly, gears C and D are fixed to the output shaft 38, gears G and H are slidably provided to the counter shaft 43, and a shift fork 40a interlocking with the change lever 40 is used to change gear G to gear C, and gear G to gear C. H
is selectively engaged with gear D.

Although not shown, the change lever 39
and 40 are temporarily lockable in the neutral and geared positions, respectively, via known spring-loaded latches.

Next, the number of teeth of each gear mentioned above is 44 teeth in total. In other words, the number of gear teeth is 21, 17, 23, and 25 in the order of A, B, C, and D.
23 pieces, 27 pieces, 21 pieces in the order of E, F, G, H
There are 19 pieces. By operating the change lever 39, the rotation ratio transmitted from the input shaft 37 to the counter shaft 43 is 21/23 from gear A to gear E, and 17/27 from gear B to gear F, resulting in a two-step deceleration. The ratio is obtained. Also, by operating the change lever 40,
The rotation ratio transmitted from the counter shaft 43 to the output shaft 38 has two reduction ratios of 21/23 and 19/25 from gear G to gear C and from gear H to gear D, respectively. In the end, the reduction transmission 36 is
Four stages of reduction ratios can be obtained.

On the other hand, the number of teeth of sprockets 58 and 59 in chain cases 56 and 57 is 12 and 20, respectively, giving a reduction ratio of 0.6. That is,
The double drive rotary 2 of this invention is suitable for tractors.
The rotation speed of the PTO shaft 12 is normally 690 rpm, and the rotation speed of the tilling rotor 27 is set to 198, 23, 287, and
It is designed to provide four levels of rotation speed of 345 rpm.

Next, FIG. 11 is a left side view showing one aspect of the device of the present invention during operation, and FIG. 12 is a subsoil crushing machine 1.
This is a rear view of the machine, showing the situation when working on almost flat farmland. In these figures, subsoil crusher 1
is directly mounted on the hitch plate 3 fixed to the rear of the tractor T with two-point support, and both drive rotaries 2 are attached to the left and right rotary mounting arms 7 at the rear of the subsoil crusher 1.
are connected. Normally, the tilling depth of the subsoil crusher 5 is adjusted to approximately 45 cm using a double-acting hydraulic cylinder 6, and the tilling rotor 27 has left and right tilling depth adjustment ruler wheels 30,
30 to adjust the tilling depth to about 30 cm, and both drive rotaries 2 till the track left tilled by the subsoil crusher 1 down cut (in the direction of arrow a) to a thickness of about 10 to 15 cm.
The additional soil K1 is stirred and mixed into the original cultivated soil K, and the leveling plate 29
The surface is leveled and the soil is created to a thickness of approximately 30 cm.

In the above state, the subsoil crusher 1
The vertical cutting pillars 5a and chisel blades 5b of the four subsoil crushing bodies 5, which are hung down and fixed at equal intervals to the sub soil K, are used to crush the subsoil of the original tilled soil K while uplifting the surface of the tilled soil.
A part of the soil K1 falls into the thin vertical groove created by the passage of the vertical blade pillar 5a and enters the subsoil.

FIG. 13 is a left side view showing the device of the present invention in an elevated state for circulation at a field terminal or the like.
That is, the subsoil crusher 1 is replaced by a double-acting hydraulic cylinder 6.
When it rises above the ground, the upper surfaces of the lower pins 11, 11 of the left and right rotary lifting guides 8, 8 come into contact with the lower surfaces of the rotary mounting arms 7, 7, and both drive rotaries 2 are moved by the rotary mounting arms 7, 7. rise above the ground.

FIG. 14 to FIG. 16 are left side views showing the mode of use when the cultivated land is uneven. FIG. 14 shows that since the tractor T pitched forward and downward, the plowing depth of the subsoil crushing body 5 became shallow, and the upper surface of the lower pin 11 of the rotary lifting guide 8 came into contact with the lower surface of the rotary mounting arm 7, and the rotary mounting Arm 7 is lifted and both drive rotary 2
This is the case when the plowing depth becomes slightly shallower. In this case, the tractor operator immediately operates the double-acting hydraulic cylinder 6 to forcibly push down the subsoil crusher 1 to correct the plowing depth to a predetermined plowing depth. At this time, the rotary mounting arm 7 pivots up and down via the pivot at the front end, and both drive rotaries 2 automatically descend to the predetermined plowing depth by their own weight, so the plowing depth becomes shallow for a very short time. There are no problems with tilling.

FIG. 15 shows a state in which the plowing depth of the subsoil crusher 1 has been corrected as described above, and both drive rotaries 2 are supported on the ground by plowing depth adjustment ruler wheels 30 on both sides, and the left and right rotary mounting arms 7 are Plows along the ground surface through vertical rotation. In addition, depending on the unevenness of the cultivated land, if the lower pin 11 is replaced with the hole 9b of the rotary lifting guide 8, the plowing depth will not be affected even if the subsoil crusher 1 slightly lifts both drive rotaries 2. You can avoid it.

FIG. 16 shows a case where the tractor T pitches forward and upward, and the plowing depth of the subsoil crusher 1 becomes deeper. In this case, until the upper surface of the rotary mounting arm 7 comes into contact with the lower surface of the upper pin 10 of the rotary lifting guide 8, both drive rotaries 2 are not affected by the lowering of the subsoil crusher 1, and the cultivated land is plowed at a predetermined plowing depth. can be tilled.

As is clear from the above explanation, the upper pin 10 and lower pin 11 of the rotary lifting guide 8 are installed at different positions in the hole 9b depending on the plowing depth of the subsoil crusher 1 and both drive rotaries 2. It is something to be replaced.

[Effects of the invention] Since the invention is configured as described above,
It has the following effects. When using the device of the present invention on cultivated land that has been sprinkled with soil, the subsoil crusher will crush the subsoil and also put the soil into the subsoil, and both drive rotaries will greatly remove the traces left by the subsoil crusher. Since the applied soil and the original soil can be well stirred and mixed at the tillage depth, it is possible to efficiently create soil suitable for crop cultivation with good water permeability and sufficient depth in a single process. . Both drive rotaries are installed at the rear of the subsoil crusher via the rotary mounting arm, and are mounted perpendicularly and horizontally to the forward direction of the tractor.
Moreover, since the rotary lift guide is connected so that the lifting and lowering can be adjusted, it is possible to till the cultivated land on which soil has been spread, even on uneven cultivated land, to some extent, independently of the vertical movement of the subsoil crusher. In addition, the double drive rotary can till the soil without reducing the plowing depth through the contact between the upper pin of the rotary lifting guide and the rotary mounting arm, and can work with the subsoil crusher through the contact between the lower pin and the rotary mounting arm. It can be made to rise above the ground. and,
Since the two rotary attachment arms are supported at their intermediate portions by the rotary lifting guide so as to be able to slide up and down, both drive rotaries can be connected to the subsoil crusher with sufficient strength.

Furthermore, the transmission mechanism of both drive rotaries rotates the tilling rotor from both sides, so
Large tilling torque can be obtained and tilling depth can be increased. In addition, since the speed reduction mechanism allows the rotation speed to be changed by a simple change lever operation, the rotation speed of the tilling rotor can be easily changed according to the speed of the tractor and the soil quality, allowing good stirring and mixing of soil into the cultivated soil. I can do it. In addition, since both drive rotaries are provided with plowing depth adjustment ruler wheels on both sides, they are stably supported on the ground and can till the cultivated soil evenly. Both drive rotaries are connected horizontally and perpendicularly to the forward direction of the tractor, and the tilling width is matched to that of the subsoil crusher, so the tillage is done without leaving any traces of the subsoil crusher, and the top soil is efficiently removed. It can be mixed into cultivated soil.

[Brief explanation of drawings]

Fig. 1 is a left side view showing the entire device of the present invention, Fig. 2 is a plan view taken along line A-A in Fig. 1, Fig. 3 is a left side view of a portion, and Fig. 4 is a front view. Figure 5 is a front view taken along line B-B in Figure 2, Figure 6 is a partial rear view, Figure 7 is a right side view of Figure 6, and Figures 8 and 9 are each a partial part. Fig. 10 is a schematic diagram showing the transmission mechanism inside the reduction transmission, Fig. 11 is a side view showing one mode during tilling work, and Fig. 12 is a side view of the subsoil crusher. FIG. 13 is a rear view, and FIG. 13 is a side view showing the state when being raised, and FIGS. 14 to 16 are side views showing the state during tilling work. 1...Subsoil crusher, 2...Both side drive rotary, 3...Hitsuchi board, 4...Machine frame, 5...
Subsoil crusher, 6, 6...double acting hydraulic cylinder,
7, 7... Rotary mounting arm, 8, 8... Rotary lifting guide, 9, 9... Rectangular frame body, 10,
10... Upper pin, 11, 11... Lower pin, 1
2...Tractor PTO shaft, 13...Universal joint shaft,
27... Tilling rotor, 28... Rotor cover,
30, 30... Cultivation depth adjustment ruler wheel, 36... Reduction transmission, 34... Rectangular underframe, 37...
...Input shaft, 38...Output shaft, 39, 40...Change lever, 44...Coupling, 45...Rotary drive shaft, 47...Safety clutch, 49...
Gearbox, 50, 51... Rotary drive intermediate shaft, 58, 59... Sprocket, 60... Chain.

Claims (1)

[Scope of utility model registration request] It is directly mounted on a two-point support in the center of the rear of a crawler tractor so that it can be raised, lowered and fixed using hydraulic pressure, and a plurality of sub-soil crushing bodies 5 are arranged at equal intervals and suspended from a machine frame 4 that is perpendicular to the direction in which the tractor moves. a subsoil crusher 1 fixed to the machine frame 4; a rotary mounting arm 7 whose front end is pivoted to the upper part of the machine frame 4 at equal positions left and right from the center of the machine frame 4;
7, and rectangular frames 9, 9 through which the rotary mounting arms 7, 7 are vertically slidably passed through in the front-rear direction, and an upper pin 10 and a lower pin 11 are inserted above and below the rotary mounting arms 7, 7. rotary lift guides 8, 8, which are passed through horizontally in a position-adjustable manner, and are erected vertically opposite each other at the rear of both ends of the machine frame 4, and below the rear ends of the rotary mounting arms 7, 7; It is fixed horizontally and perpendicular to the forward direction, and has plowing depth adjustment ruler wheels 30 on both outer sides, and a reduction gear mechanism 36 that changes the rotation to an appropriate number of stages in front of the center of the top, and connects the PTO shaft 12 of the tractor to the universal joint shaft. 13 to the reduction transmission 36, and is rotated in a down cut with the tilling width of the subsoil crusher 1 through a transmission mechanism provided in conjunction with the reduction transmission 36 at the rear of the reduction transmission 36. 2, when the subsoil crusher is raised, the upper surface of the lower pins 11, 11 and the rotary mounting arms 7, 7 are provided.
A device for stirring and mixing additional soil into cultivated soil at the same time as crushing the subsoil, in which both side drive rotary 2s are raised above the ground together with the subsoil crusher through contact with the lower surface.